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Old 11-04-2011, 08:37 AM
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More of a question than a problem

I just purchased an 05 F350 4x4 longbed crew cab with the 6.0. My question is in regards to the rear differential. My F250 had posi-track (or what ever ford calls it) but I'm not sure this one does. The other day I was turning and when my right front tire went up on a small bump, the right rear tire spun. Does anyone know if this truck is equipped with the clutches in the rear diff?

I read the owners manual and it's no help. Figured I take it to the experts here before I allow the dealer to lie to me....
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Old 11-04-2011, 09:03 AM
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There should be a tag (or two) on the rear diff cover. Write down the codes and post them
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Old 11-04-2011, 09:24 AM
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I believe the driver's side door sticker will also have an "L" in the axle code if your truck came with it.
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Old 11-04-2011, 09:45 AM
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I couldn't find an axle code on the door sticker but I did get the info from the tags.

First tag:

V 445 B
L 73 10 2 4L22

Second tag:

5W140 SYNTH
OIL ONLY


What's the call?
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Old 11-04-2011, 09:49 AM
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Limited slip, 3.73 gears
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Old 11-04-2011, 10:23 AM
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Thanks.
#@$%&$#@! That means I may have clutches out. Maybe I'm not testing it right. Any ideas on a good test?
Don't they normally pop and jerk when they are going out? Tomorrow, I'll jack up one side and try to spin it.

Thanks again.
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Old 11-04-2011, 10:29 AM
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Or, is the limited slip the one without the clutches?
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Old 11-04-2011, 10:36 AM
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Limited slip has a clutch pack. Just because you had a wheel off the ground and it spun, and the other side didn't, doesn't mean there is anything wrong. Limited slip differentials just plain suck in that situations. It is NOT a locker, so it will not lock like you think a limited slip would.
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Old 11-04-2011, 12:33 PM
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Okay. That's what I was thinking. My 250 had the Traction Lok diff. I'll look into converting this one to what I had before. I spend a lot of time in sand washes and absolutely hate shoveling.

Thanks again for your help.
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